Multi-spectrum sensing device and manufacturing methods thereof

1. A multi-spectrum sensing device, comprising at least one top layer and one bottom layer, wherein said top layer comprises sensing pixels for sensing a first group of colors, said bottom layer comprises sensing pixels for sensing a second group of colors, and at least one of the top and bottom layers comprises sensing pixels for sensing at least two or more spectra, wherein: a lower layer senses a color having a wavelength longer than the wavelength of a color sensed at a corresponding position in a layer upper to the lower layer, and a spectrum of a color sensed in a lower layer is orthogonal to total spectra of colors sensed at corresponding positions in all layers upper to the lower layer within a spectral space of visible light, and wherein a spectrum of each of colors sensed in the bottom layer is orthogonal to the total spectrum of a color sensed at a corresponding position in all layers upper to the bottom layer either within a spectral space of visible light or a composite spectral space of visible light and infrared light.

2. The device of claim 1 , wherein the device consists of one top layer and one bottom layer.

3. The device of claim 1 , wherein each of said spectra comprises a combination of the spectrum of blue, green, red and infrared.

4. The device of claim 1 , wherein said first group of colors comprise one of the following: A. at most four kinds of colors selected from blank, color, blue, green and cyan; B. blank color or blue; C. blank color, blue and cyan; D. blank color, blue and green; E. blank color, green and cyan; and F. blank color, blue, green and cyan.

5. The device of claim 1 , wherein the spectrum of a color sensed in the lower layer is complementary to the total spectra of colors sensed at corresponding positions in all layers upper to the lower layer within a spectral space of visible light.

6. The device of claim 1 , wherein the second group of colors comprise at most four kinds of colors selected from the color group consisting of green, red, yellow, white, infrared, red plus infrared, yellow plus infrared, and white plus infrared.

7. The device of claim 1 , wherein the sensing pixels are arranged in a pattern selected from the pattern group consisting of a uniform pattern, a horizontal pattern, a vertical pattern, a diagonal pattern, a generalized Bayer pattern, a YUV422 pattern, a horizontal YUV422 pattern, a honeycomb pattern and an equal spacing pattern.

8. The device of claim 2 , wherein the top layer comprises a first group of sensing pixels for sensing intensity of visible light (white), and the bottom layer comprises a second group of sensing pixels for sensing intensity of visible light and infrared light (white plus infrared).

9. A method for manufacturing a multi-spectrum sensing device, comprising providing at least one top layer and one bottom layer, wherein: the top layer comprises sensing pixels for sensing a first group of colors, the bottom layer comprises sensing pixels for sensing a second group of colors, and at least one layer comprises sensing pixels for sensing at least two or more spectra, a spectrum of a color sensed in a lower layer orthogonal to the total spectra of colors sensed at corresponding positions in all layers upper to the lower layer within a spectral space of visible light, and a spectrum of a color sensed in the bottom layer is orthogonal to the total spectrum of a color sensed at corresponding positions in all layers upper to the bottom layer either within a spectral space of visible light or a composite spectral space of visible light and infrared light.

10. The method of claim 9 , wherein only one top layer and one bottom layer are provided without middle layers.

11. The method of claim 9 , wherein the spectra comprise a spectrum of blue, a spectrum of green, a spectrum of red and a spectrum of infrared.

12. The method of claim 9 , wherein the first group of colors comprise one of the following: A. at most four kinds of colors selected from blank color, blue, green and cyan; B. blank color or blue; C. blank color, blue and cyan; D. blank color, blue and green; E. blank color, green and cyan; and F. blank color, blue, green and cyan.

13. The method of claim 9 , wherein a lower layer senses a color having a wavelength longer than the wavelength of a color sensed at a corresponding position in a layer upper to the lower layer.

14. The method of claim 9 , wherein a spectrum of a color sensed in a lower layer is complementary to total spectra of colors sensed at corresponding positions in all layers upper to the lower layer within a color space of visible light, and a spectrum of a color sensed in the bottom layer is complementary to the total spectrum of colors sensed at corresponding positions in all layers upper to the bottom layer within a spectral space of visible light or a composite spectral space of visible light and infrared light.

15. The method of claim 9 , further comprising: providing a layer line for delaminating the sensing pixels such that all colors in an upper layer are above the layer line and all colors in a lower layer are below the layer line.

16. The method of claim 15 , wherein the layer line is a color separation line between blue and green, or between green and red, or between red and infrared, or a boundary line of the maximum interested wavelength of infrared light.

17. The method of claim 9 , wherein only one layer comprises sensing pixels that sense two spectra and are placed in a horizontal pattern, a vertical pattern or a diagonal pattern; and the other layers are blank or comprise no sensing pixels.